I was on Fandango where you can already buy tickets for Thor: Ragnarok, and the length of the film there is stated as 2 hours 10 minutes (see my screen capture attached). That would seem to contradict the much shorter running time released earlier.

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http://screenrant.com/thor-ragnarok-new-origin-movie-sequel/

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Also, this Taika Waititi interview with Screen Rant might alleviate some concerns with the third film and the Hulk upstaging Thor. He states, "Personally I feel like... if the movie’s called Thor, then Thor should be the best character."